Lukman, Hamidah Suryani, Nur Agustiani, and Ana Setiani. 2023. “Gamification of Mathematics Teaching Materials: Its Validity, Practicality and Effectiveness”. International Journal of Emerging Technologies in Learning (iJET) 18 (20):pp. 4-22. https://doi.org/10.3991/ijet.v18i20.36189.